Adamantine: Mined from rocks that fell from the heavens, this ultrahard metal adds to the quality of a weapon or suit of armor. Weapons fashioned from adamantine have a natural ability to bypass hardness when sundering weapons or attacking objects, ignoring hardness less than 20 (see Additional Rules). Armor made from adamantine grants its wearer damage reduction of 1/— if it's light armor, 2/— if it's medium armor, and 3/— if it's heavy armor. Adamantine is so costly that weapons and armor made from it are always of masterwork quality; the masterwork cost is included in the prices given below. Thus, adamantine weapons and ammunition have a +1 enhancement bonus on attack rolls, and the armor check penalty of adamantine armor is lessened by 1 compared to ordinary armor of its type. Items without metal parts cannot be made from adamantine. An arrow could be made of adamantine, but a quarterstaff could not.

Weapons and armor normally made of steel that are made of adamantine have one-third more hit points than normal. Adamantine has 40 hit points per inch of thickness and hardness 20.

Type of Adamantine Item Item Cost Modifier
Ammunition +60 gp per missile
Light armor +5,000 gp
Medium armor +10,000 gp
Heavy armor +15,000 gp
Weapon +3,000 gp

Adamantine Firearms constructed of adamantine can handle a much larger dose of black powder when being fired, allowing for more powerful shots. A firearm constructed out of adamantine receives a +2 bonus to damage rolls within its first range increment, and a +1 to damage rolls outside of its first range increment, although it requires an additional dose of black powder when firing to gain this benefit.
Cost +3,000 gp